3Com Switch 7750 Configuration Guide Guide

366 CHAPTER 37: IP ROUTING POLICY CONFIGURATION
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Among the nodes defined in a route-policy, at least one node should be in permit
mode. When a route-policy is applied to filtering routing information, if a piece of
routing information does not match any node, the routing information will be
denied by the route-policy. If all the nodes in the route-policy are in deny mode, all
routing information will be denied by the route-policy.
Defining if-match Clauses for a Route-Policy Node
An if-match clause defines a matching rule, that is, a filtering condition that the
routing information should satisfy for passing the current route-policy node. The
matching objects are some attributes of routing information.
Perform the following configuration in route-policy view.
By default, no if-match clause is defined.
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■ The relationship among the if-match clauses in a route-policy node is logical
"AND". That is, a piece of route information can pass the filter of a node and
the actions in apply clauses will be taken on it only when all the matching
conditions specified by the if-match clauses in the node are satisfied.
■ If no if-match clause is defined for a node, all routing information will pass the
filter of the node.
Tabl e 292 Define if-match clauses
Operation Command Description
Enter system view system-view -
Enter route-policy view
route-policy
route-policy-name { permit |
deny } node node-number
-
Define a rule to match the AS
path field of BGP routing
information
if-match as-path
as-path-number
Optional
Define a rule to match the
community attribute of BGP
routing information
if-match community {
basic-community-number [
whole-match ] |
adv-community-number }
Optional
Define a rule to match the
destination IP address of
routing information
if-match { acl acl-number |
ip-prefix ip-prefix-name }
Optional
Define a rule to match the
next-hop interface of routing
information
if-match interface
interface-type
interface-number
Optional
Define a rule to match the
next-hop address of routing
information
if-match ip next-hop { acl
acl-number | ip-prefix
ip-prefix-name }
Optional
Define a rule to match the
routing cost of routing
information
if-match cost value Optional
Define a rule to match the tag
field of RIP or OSPF routing
information
if-match tag value Optional